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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '522b2578a3d27a1ddccfb755bb7c24da6d8769378b78909b6bc7eed5d406edf5' 
  AND token = 'UJHlu7toA9y1vlguTXbwOMeS2fELCyS7MDRDTauCxCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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