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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de3515faba2c869eaf1913ad7f270f59375a4edff36a66b304f0b2d637a58a8d' 
  AND token = 'PprGUY3sHIM1vaOONx2xkuI6Qol5G91NCvuGztflzfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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