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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce8aeda7fabe75eda627ae1e93fb37ff04534000927a028bc4b4c490fb27648a' 
  AND token = 'jYQlXWXR1uzSB0AhYg6WEEvCgtWxlwzXTkYrAkCb+9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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