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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10f3c47056a77b771137745c276829a264244c020d1cf83f8b5f77db999ae9d0' 
  AND token = 'I00XoWgXLNElD5MnMhaOPTrkHBPF7GKQGdqsDREoSkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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