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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56ca0c37da3869a2064f1c019febe9931f40f31c757208a07281417c4feaf9a0' 
  AND token = 'qxHVTv4GQW2s8Zsxy/IVNmENKyGCr5rcTAfUTC2cUMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}