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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7ea5ae4b65c6022a6c41ab43b3cb79a4b2e344956eeb5a43128af3464b35526' 
  AND token = 'F/37PUOowhArEeCvO5FiiF04LpjI9R38cQGuIGg2oec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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