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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f562c21af560f8cc618df7777a4a3fd621b56d793f316102e66ad785f3953bdb' 
  AND token = 'ZjIfrykcj0M3vGvkEPmUM1hoRO0IKhQ+h3GD3caEh10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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