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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4f48f7a7642841e715970c047b5ed0d9b1c4f55f851bb80b905c864b853a89a' 
  AND token = 'WxYmtLLHfKKZtkPzg5uyBkVHCUEaLRE0Ya/qeCQ5H8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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