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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fa19943e9351dd212f91a22cd4cbe0065fca993e180ec0f7cc7c5859d539d49' 
  AND token = 'jUIIH0UFIhlQduFLrcGKFYm0b1LetBoTaMSWN9XoDLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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