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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e6b276010d8882e7e19dffb9d95adc2908ac404db85954174c06bbf4491e0d4' 
  AND token = 'NKE+7l+jh/MczL9Nme8oUoLfaRAvyze/o336QY+hcGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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