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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a95d597d4fc1e7ce76b0cb5228cb3811ef9bdb61520da6b30b3603c57d540c3' 
  AND token = 'YJ2V0qfSkaoXzp8he5OkNuHqXoaaDmqLk8Hn/ETgHjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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