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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f7f476b9152f0173658dd9e7b81d157ea26105a90b4d626e4d3aecd0be89b77' 
  AND token = 'C0jM4qG9UMVekXKoF53ixlnJgQLhj6fc7KdgNdn41xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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