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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e461064cb97f69dfa1f5c167e26c4f0487e278546768846c2590f92c19451fbc' 
  AND token = 'fXtSUG4jaOCqGqSSm+Z1udbWsBkW2OUBGftvL8cMk7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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