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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b79cd4ca40375917507c9fde8ca3d3c69da9fed5b27da69274ade2a77e0588a' 
  AND token = 'hDLbS53vL2Bvgwl30JjLrTTy728E6Wp7nA8AnLX1BSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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