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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd12e8a88c6e670b0bc84536acdcb339b16946d425c352305d44429e569da65e7' 
  AND token = 'oTkkD9GaerO+ADKkOVSjUdPajA1FfRoz724AaFh8izQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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