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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7c67b4088d6f2e7b460254b8afb10d1d7bd5efa444432905ce58cbd39b5b94c' 
  AND token = 'UwEzcb5BriHYsDkOb8k1j2AKLrgkyNoJkEZSgVP+yD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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