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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7803b55fcf5fcd8ae830acb51fb306c9426d455bd7b1d9fbb7115e52fca7f255' 
  AND token = 'wornfRNi/zrk21ttOIumMzuAxPZfdkpC8036wfL25GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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