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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd0fe170a053f5036a864f0f857ac4fde96980dc860f2b2663b939893301e7cc' 
  AND token = 'L4AENTOopODJ62Wwi5mpPtgsprtrT6ahgXwZ3rK8R9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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