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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae7f119b19960c257cee5dd3c50be2d00f8b7be5f58ea58e1f43e35553a367e0' 
  AND token = 'cT5DgJkkx5UdKC/B8OxKN9K1PfQfQEeZoyjPTWaPUh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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