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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef3bd06b4709893f414d20b82f112c5a6845b04580d380b4fcc0f72bb8d8a55a' 
  AND token = 'u7DLI7In4RU3FKsMs9uZ29Kyczr9BvMLN8jl434cZXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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