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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a93bf8362ebfac6e529151c9d1d778331f5a5d0350a2d8abcf32dc96ff189b7f' 
  AND token = 'Nkmc70o/josNV2WEcazbaaX0mJbImM264G4Jkae2AX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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