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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38180821c99ac5e2d7c00edb0505905fcabbccdf3ef39119102d0693690c3294' 
  AND token = '7dGCMxUQ0b05yLcdCLtozIF0euPmd9UJ6FqkGAH5dSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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