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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97c2d87c3e159bcc4cd4ae795342ae234a844840f163ee18071b0ec856a4df50' 
  AND token = 'x9sTninTDbfWmPGLCGaE5jYXJHv6AV2m+6NHVQd1a8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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