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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '917e99fe0e30417b2584ecbd97161e17458aba9aca9dcafb9e286678e902df6d' 
  AND token = '+VPPmsNiaOhJdep7xd0cZP5RArWOI7LfuwntIxkOVVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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