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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '027c643aaa28cbdbdf369fa7e2d4c4b66157babf89747147d859bcf19ba1fab9' 
  AND token = 'v0Zr21ODn8Vhfrht5YiFpT4n1ecPeYnItxkNGH0Isac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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