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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb92b7f917af34b69a3f5837ecd2840f0529b0ea896adfbd36dd06a799642cc5' 
  AND token = 'VUG+dpYd4WbMknZ2b9F9SYx3JlAt4mcDZl3Ve8g4fHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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