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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '579cfb975e59da09eb405dfbd700141f332635cfd2edbdf5e9e7f39cde9ba2db' 
  AND token = 'Bb0gE49qKAUpw+bFCa6wiSR2x61mvIzdS4M+h9O8EOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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