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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f1937fb8c830178ec41f7635351e5d4f92c2355a35617305ca828f4e3634ed6' 
  AND token = 'aULjd+Dch1qtmPCWeQ01BWuuSOY2WPrG2SG4NPGwTns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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