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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33f4c102826cacabf3cbd316a3665f0131d1981d364bed58ba154e1af3b6e67c' 
  AND token = '8kyhEMSdJtCR4YwvX0lWCuWIRsq4XBsz1y9zuNK4hzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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