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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '286ff27afb4d5a2a369fc214a212fe3465d75b56124436ec6acac1e4080f3aa1' 
  AND token = '2iW0XoBjyJMxDTX3K11zL5HdIi/MGUr1sVhlPROind4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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