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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9e625521f99d6d7ce65be27fea80c495fc625181f9753b6954f07616aed1c5d' 
  AND token = 'OSkk4tHQ154gK7lw4jiHjAsQuPowavJyCIo3xYbE26g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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