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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af760a06b4e977e6e8a640404a40baffc12629a37fb32dffede5a477510c874b' 
  AND token = 'TKqUoMM0S1ayoXuQfqR6CJLXiNn/NmU+vk6M2fGkPGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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