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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '346a4ed334bb6bcf432de0443e1b85cec73c200f7eb91746553be8156bf37581' 
  AND token = 'UfyYHrz5NG7fGnIiczv11iaeKk3fgfWdu4Vbj9zZgZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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