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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '880a8b2c0328d084e36ed10146fe27f91a276038353be337bd379965c0d3ecfa' 
  AND token = 'LxAxUr9fWgMagvSAug9LfaXwQyVAWqoNpO9zRxtcKcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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