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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24236f0ee250bc11923d5a3bdadc272a2a2aeec420b20ab309abb84f8289a2ca' 
  AND token = 'rHVi2yIgf8kVqjlwifDM40g8MfiP/VY3dAu8f3a0ZTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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