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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb49691f91c66da5ae40be92e83e3642eb1db5f015abab383e994fae3c314733' 
  AND token = 'XQ93Eayss1EgRdx4VeM4g96KwQHyT0o0Fkxp8Bl9GuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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