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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2abd8e90741c799f1b15234eb7dbadbe0568bb82be90b102c7b8c34869d33bc' 
  AND token = '5oNNMtvTtU/DyMQsukBmttsz5qqrP3RL+G4CEv1CXBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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