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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31048947a2c0a76a446f89bd95a9a70642d98d712e7579c4064f86064f447256' 
  AND token = '/rpcm7lzlcMcCo+Ghr8bUV1qRFNcjEz1grI2zky/HbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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