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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16306b2f8dd08d8f3eb3f9629f52d30a81df274c11e22c04a9817917513ed5ba' 
  AND token = '3Kk2O6uPlk+GQttq2LQ01zRffFHvMz9iYklz6pX0aYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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