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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd93db94a0dc0d631074e3a2c5dd92bbde02cf5606ae2c739f712078300ea6e9e' 
  AND token = 'F2ehSJ8qZentxpuOHw/2Ht0VFUXRgRNq6FFfhdIFB08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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