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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46e7e77052cebe0eac99f6167a03dfd3836b2ae41ddf7384b005266abbbcae65' 
  AND token = '4Xo4g4yRVI9TEVIjdI1R5UCkazy+iuIsc1GPDJ9eIOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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