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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fb89ce8dab9b537e5eb0d70cf27c9e2d380b43a8a445065da1de5bc75b0f903' 
  AND token = '9+1uE04BbAX5KV1xb1i2dsLuaH8yZoQ3FN89eJ80e9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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