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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f3f271f0b950c96353f19a39226555f5f50b0ddf196870351d5dd7faf29ba42' 
  AND token = 'cJRZQxRRojBQl32eODFjTCpnaMxB6VrSrN8Xvd2cNNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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