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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9e07f69802aa3cd0a7515d0397fa48ea6c8325ad4b30a639792e295e6d6548c' 
  AND token = '+ifiry395QddxfDqnJg/q5ngTGKrE2JyGx/13HNr3Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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