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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '703c02d11d47669eccff75a0717ffec2540b41b041016c42e15a935de7cbe920' 
  AND token = '17rPKD7eQY5pH7LFvJJzkKK9HNLCwfKhveBuTBfSyUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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