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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8d2856123c4ea3b28cfb5c1c408df0973717a627c9ac4033107b12821e3a7e0' 
  AND token = '6ea30paxUC/dtIJLzxImyzBWiQZe6K/lsVkJ9Eboo3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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