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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd028fc5cfce1e3b8ab17b83da37d4a09a12605d21a449d0aa0479bf318743cb0' 
  AND token = 'YZcbsqgA4s5iXXJnt8C3YOyGk1n6dGP2MgxnQy2TKfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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