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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53dedaeb44568eb515eb3da0bff3f7bf6987048fb3bb0e35c9fac26637ce369d' 
  AND token = 'D3dw0S6LXv1IlSHCmOmdOr4Mf1cO0Om7ISBEtMchXg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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