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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ee0b52072ce61bbbeac34d533a4254b1ece4f7b533972e5d9b7ed8e56b10396' 
  AND token = 'drLiLz0G/0WeRQ7p3HsCUo7zBuKiJ8IUVi5I6ogdRhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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