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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92fc4edcb269fe390ab4b1e11bb78f1e5e1bb1793223520daf49b1dafa59d7a7' 
  AND token = 'p3hIxbjBriKNE065TEHpJ2RYFO/RcKccSZBv8MUeE9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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