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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be5ddeccc8cbdb5ce43aa85bdd08032f273f58215806e5a567911b23adf0d9d1' 
  AND token = 'WObl5X3YSRuSV/FXiCk7rBCsk9z3SDka3N+8sNXUOsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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