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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec83486dca54f0f77a0b212b71a3017054c9cbef5543039dc7f894ff54463cf1' 
  AND token = '+2Q/opG8t8a4u0pyemKruQCDXH58uZVO1jO0VbIZLPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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