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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d96b8d26b1eebb77f9a0bbf14f43158c8217162e18bb88371caea958148c137' 
  AND token = 'm85oLLDMGE0mumLmzVzXJpDpS8OetpELOPVKZiUji7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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