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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0eea56a334fd5a539610102c1e154bdab0d656c95b2353919605c1c9d96c2ee4' 
  AND token = 'VSZkWd3FTUqSJK3jXizfV5uMkbMikN+ml7wDGe/y70A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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