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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7b7addd4d4608219774bc7f649287941fcedb64018895843bdc5d1d0f52d452' 
  AND token = '8v6ejwuxUOJWyn8+AEJ6UgLlLggXYfMkoEc4B1v0c6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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