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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a35ec54aa69a9b0fb0cd08ccfd44c1d49f7ab2eff66eeab07dddbfafb6f5b1d1' 
  AND token = 'lXfpJFeTfm86N6xq3hf07qccyGV4tMKsS6Kv4E0ieFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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