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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7a66a4934ee52a3102e6d1141a97208d3cd61ce6e10203fd882903d6b2c6668' 
  AND token = '68bAb+/+l5qO9FzZ186RDJMt5Qfcmi5I1mQD3bikz4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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